RemoveAsset.java

/**
 * Copyright 2010 CosmoCode GmbH
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.cosmocode.palava.media.directory;

import java.util.Map;

import javax.persistence.PersistenceException;

import org.apache.shiro.authz.annotation.RequiresPermissions;

import com.google.common.base.Preconditions;
import com.google.inject.Inject;
import com.google.inject.Singleton;

import de.cosmocode.palava.core.Registry;
import de.cosmocode.palava.entity.EntityService;
import de.cosmocode.palava.ipc.IpcArguments;
import de.cosmocode.palava.ipc.IpcCall;
import de.cosmocode.palava.ipc.IpcCommand;
import de.cosmocode.palava.ipc.IpcCommand.Description;
import de.cosmocode.palava.ipc.IpcCommand.Param;
import de.cosmocode.palava.ipc.IpcCommand.Params;
import de.cosmocode.palava.ipc.IpcCommand.Throw;
import de.cosmocode.palava.ipc.IpcCommandExecutionException;
import de.cosmocode.palava.jpa.Transactional;
import de.cosmocode.palava.media.MediaPermissions;
import de.cosmocode.palava.media.asset.AssetBase;
import de.cosmocode.palava.media.asset.AssetConstants;

/**
 * See below.
 *
 * @since 2.0
 * @author Willi Schoenborn
 */
@Description("Removes the specified asset from the given directory")
@Params({
    @Param(name = DirectoryConstants.DIRECTORY_ID, description = "The identifier of the directory"),
    @Param(name = AssetConstants.ASSET_ID, description = "The identifier of the asset")
})
@Throw(
    name = PersistenceException.class, 
    description = "If asset or directory do not exist or updating failed"
)
@Singleton
public final class RemoveAsset implements IpcCommand {

    private final EntityService<DirectoryBase> directoryService;
    private final EntityService<AssetBase> assetService;
    
    private final DirectoryRemoveAssetEvent removeAssetEvent;
    private final DirectoryRemovedAssetEvent removedAssetEvent;
    
    @Inject
    public RemoveAsset(EntityService<DirectoryBase> directoryService, 
        EntityService<AssetBase> assetService, Registry registry) {
        this.directoryService = Preconditions.checkNotNull(directoryService, "DirectoryService");
        this.assetService = Preconditions.checkNotNull(assetService, "AssetService");
        Preconditions.checkNotNull(registry, "Registry");
        this.removeAssetEvent = registry.proxy(DirectoryRemoveAssetEvent.class);
        this.removedAssetEvent = registry.proxy(DirectoryRemovedAssetEvent.class);
    }

    @RequiresPermissions(MediaPermissions.DIRECTORY_SET_ASSET)
    @Transactional
    @Override
    public void execute(IpcCall call, Map<String, Object> result) throws IpcCommandExecutionException {
        final IpcArguments arguments = call.getArguments();
        
        final long directoryId = arguments.getLong(DirectoryConstants.DIRECTORY_ID);
        final long assetId = arguments.getLong(AssetConstants.ASSET_ID);
        
        final DirectoryBase directory = directoryService.read(directoryId);
        final AssetBase asset = assetService.reference(assetId);

        removeAssetEvent.eventDirectoryRemoveAsset(directory, asset);
        
        directory.getAssets().remove(asset);
        directoryService.update(directory);
        
        removedAssetEvent.eventDirectoryRemovedAsset(directory, asset);
    }

}